Android Developers Blog

We had a lot to talk about this year at I/O. We launched Google Play services 3.1 with Google Play games services, improved Location APIs, and Google Cloud Messaging enhancements; Android Studio: A new IDE for Android development based on IntelliJ IDEA Community Edition; and Google Play Developer Console improvements such as app translation service, revenue graphs, beta testing & staged rollouts, and optimization tips.

With the excitement of these announcements behind us, it's time to sit back, relax, and watch all the sessions we missed during the event. To make that easier, we've collected all the Android sessions together in the Android @ Google I/O 13 page on the developer site.

For those of you who prefer listening to your I/O talks without the distraction of watching speakers and slides, we're also making the sessions available as part of the Android Developers Live Podcast.

This week we resumed our regular broadcasts with Android Design in Action offering a review of Android Design sessions at I/O. Next week will see the return of This Week in Android Development and The App Clinic, and stay tuned for more episodes of Table Flip, GDG App Clinics, and more!

We'll also continue to add new DevBytes and BizDevBytes to offer tips and tricks for improving your apps and making them more successful.

As always you can talk to us and keep track of our upcoming broadcasts, Android Studio news, and other Android developer news on the +Android Developers Google+ page.

One of the things users like most about Android is the flexibility to choose which apps should handle common tasks on their devices — from opening a web page or sending an SMS to playing a music file, taking a picture, or making phone calls. This flexibility is provided by Intents.

Intents give you a powerful way to integrate your apps deeply into the system — users can even choose to let your apps replace functionality provided by system apps. In those cases, it’s essential to make sure that anything your app can’t or doesn’t handle can still be handled properly by the default system app.

Proper implementation and testing are especially important for apps that provide telephony services. Make sure that your app doesn't interfere with emergency calling by listening for the wrong intent — CALL_PRIVILEGED. Follow the best practices below to handle outgoing calls the right way, using the NEW_OUTGOING_CALL intent.

Listening for outgoing call requests

Apps that provide phone calling services (such as VOIP or number management) can set up Intent filters to handle outgoing call requests, such as those made from the Dialer or other installed apps. This provides a seamless integration for the user, who can transition directly to the calling service without having to redial or launch another app.

When the user initiates a call, the system notifies interested apps by sending an ordered broadcast of the NEW_OUTGOING_CALLIntent, attaching the original phone number, URI, and other information as extras. This gives apps such as Google Voice and others a chance to modify, reroute, or cancel the call before it’s passed to the system’s default phone app.

If you want your phone calling app to be able to handle outgoing call requests, implement a broadcast receiver that receives the NEW_OUTGOING_CALLIntent, processes the number, and initiates a call as needed. Make sure to declare an intent filter for NEW_OUTGOING_CALL in the receiver, to let the system know that your app is interested in the broadcast. You’ll also need to request the PROCESS_OUTGOING_CALLS permission in order to receive the Intent.

Note that the system broadcasts NEW_OUTGOING_CALL only for numbers that are not associated with core dialing capabilities such as emergency numbers. This means that NEW_OUTGOING_CALL can not interfere with access to emergency services the way your use of CALL_PRIVILEGED might.

Because the NEW_OUTGOING_CALL broadcast is ordered, your app can choose whether to consume the call request itself or simply process the number and pass the result data on to other apps that may be interested. In this example, the broadcast receiver brings up a phone call on it’s own service and sets the result data to null. This prevents the call request from reaching the default phone app.

An anti-pattern

Rather than listening for NEW_OUTGOING_CALL Intents, some apps have mistakenly set up intent filters for CALL_PRIVILEGED Intents as a way to handle outgoing calls. This is not a recommended approach, because the system may send a CALL_PRIVILEGED Intent for any number, including emergency numbers. Since non-system apps can’t reformat emergency numbers or place emergency calls, attempting to handle CALL_PRIVILEGED could inadvertently interfere with access to emergency numbers.

CALL_PRIVILEGED should only be used by apps that have the necessary signatureOrSystem-level permission — it is not designed for use by any third-party apps.

Check your apps for proper use of NEW_OUTGOING_CALL

If your app provides phone calling services and already uses intent filters to handle outgoing call requests, take a few minutes to make sure it is listening for the proper Intent: NEW_OUTGOING_CALL.

If your app includes intent filters that listen for CALL_PRIVILEGED Intents, make sure to remove those filters and related code from the app (in favor of NEW_OUTGOING_CALL) and publish the updated app as soon as possible.

A key focus of Google Wallet is to simplify commerce for merchants and shoppers; for over a year now, consumers on Google Play have been using Wallet to make their purchases, to the benefit of the entire ecosystem. Helping merchants benefit from the growing consumer adoption of mobile commerce is where we believe we can make the most impact. And that’s why today we're focusing our efforts on the new Google Wallet Merchant Center and retiring Google Checkout over the next six months.

Most Google Play apps developers will seamlessly transition to the Wallet Merchant Center, which provides new reporting and analytics features and much more. A small number of Google Play developers, however, will see some changes:

Developers using Google Checkout on their website to sell physical goods or services will no longer be able to use Checkout after November 20, 2013. We have provided some discounted migration options to help with this change. If you are a U.S. merchant selling physical goods and services who does have payment processing, you can apply for Google Wallet Instant Buy, which offers a fast buying experience to Google Wallet shoppers.

Developers who use the Google Checkout for the Notifications and/or Order Reports API(s) will need to migrate to replacement APIs, made available through Google Play, before November 20, 2013. Watch for announcements on the new APIs soon.

If you sell apps or in-app products in Google Play, you’ll soon have access to the new Wallet Merchant Center. Watch for an email notifying you that that it’s now available to you. We expect to transition all merchants to the Wallet Merchant Center over the next several weeks.

We invite you to join us for our live merchant webinar on May 23, 2013 at 10AM PDT to learn more and ask any outstanding questions. As always, feel free to contact us at any time during this transition. Finally, be sure to check out the exciting updates launched last week at Google I/O (including Instant Buy and Wallet Objects) and stay tuned for more great developer features coming soon!

This week at I/O, we were excited to announce some updates to Google Play to help you optimize your business on Google Play: to help you take control of your app publishing, gain insight into your users, and expand your app’s success globally.

Play Store’s new view: apps designed for tablets

Many of you have invested in making great tablet experiences for your users, and we want to ensure that that work pays off and that users are able to discover great apps for their tablets. This week, the Google Play store began providing a view of our top charts highlighting apps which have been designed for tablets according to our tablet app quality checklist.

Beta testing and staged rollouts

We have introduced support for beta testing and staged rollouts so that you can get feedback on your new app or app update early in its development and make sure your users are happy with the results. You can test two different versions on two different groups at the same time, such as testing a newer version with your employees first, and a more mature version with a group of external testers.

The beta testing is private on Google Play, and you can specify who gets these versions by adding Google Groups and Google+ Communities. Users give you feedback privately rather than through public reviews. When you’re satisfied that your new version is ready, you can now do a staged rollout to a percentage of your userbase. To give you more flexibility in light of beta testing and help get your whole team involved in the Developer Console, we will soon launch additional access controls.

Localization improvements

We’re collaborating with Google's internationalization team to make translating your app into new languages easier than ever. You can purchase professional translations of your apps from independent providers through the Google Play Developer Console. You can upload the strings you want translated, select the languages you want to translate into, and select your translation vendor based on time and price. If you’re interested in translating your apps with this feature, sign up to be a part of the preview in the Developer Console today on the APK page.

The new optimization tips for localization will help you identify new potential opportunities for global expansion based on popular languages for your app’s users and category. To fully localize your app into a language, you need to translate the strings in an APK, translate your Google Play store listing, and upload localized graphics. The optimization tips will also let you know if you’re missing any of these pieces.

New Analytics and monetization features

Getting better revenue and engagement data has been another key developer request, as developers told us that they check their revenue and stats constantly. New revenue charts in the Developer Console allow you to see your app’s daily revenue and summary figures, and you can filter the data by country. Coming soon, Google Play and Google Analytics are teaming up to bring you better insight into your users. Google Analytics will start showing Google Play views and installs for each campaign, while Google Play will show Google Analytics engagement metrics.

For those of you using in-app billing, we’ve heard your feedback and made some improvements to reduce your development time and costs. Your test accounts will now able to make in-app test purchases without those transactions actually being charged, but everything else works the same as it would for a real user.

In a few weeks, we will launch a new Order Status API, which allows you to verify the status of an in-app order from your servers. We will also be launching a tool for automating downloads of financial reports. Finally, the new Google Wallet Merchant Center is continuing to roll out with enhanced reporting, additional analytics and many other enhancements.

Google Play for Education coming soon

You'll soon be able to offer apps to schools through Google Play for Education, which launches later this year to K-12 schools in the United States. This online destination will allow schools to discover, purchase, and distribute apps to their students. Visit developer.android.com/edu to get started creating or optimizing your apps for schools today.

Posted by Greg Hartrell, Angana Ghosh, Francesco Nerieri, Francis Ma, and the Google Play services team

Some of the most exciting Android announcements at Google I/O this year are part of our latest Google Play services release, version 3.1.

The new version brings you Google Play games services, part of a new cloud-integrated platform for social gaming based on Google+ identity. Also included are location-based services that make it easier to build efficient location-aware apps. For apps using the popular Google Cloud Messaging platform, you can now take advantage of XMPP messaging and easier setup. Finally, Cross-Platform Single Sign On for Google+ Sign-In is now available to your apps.

You can get started using these APIs and services right away—Google Play services 3.1 is already rolling out to Android devices across the world, with support reaching all the way back to Froyo.

Google Play games services

Google Play games services lets you make your games more social, with achievements, leaderboards, and multiplayer, and they help you extend your user’s games across multiple devices by storing game saves and settings in the cloud.

You can take advantage of the new services right away using the games services SDK included in Google Play services. For all the details, check out the Google Play games services documentation.

Location APIs

If you build location-aware Android apps, you’ll want to check out the new location APIs. They make it easy to build accurate, fast, and efficient apps, with new contextual features.

The Fused Location Provider intelligently manages the underlying location technology and gives you the best location according to your needs. We’ve simplified the location APIs and completely rewritten our location algorithm to make location more accurate, flexible and use less battery.

Using the new geofencing API, your app can set up geographic boundaries around specific locations and then receive notifications when the user enters or leaves those areas.

With apps becoming increasingly contextual, understanding what the user is doing is critical to surfacing the right content. A new activity recognition API makes it easy to check the the user’s current activity — still, walking, cycling, and in-vehicle — with very efficient use of the battery. We use low-power sensors and machine-learning classifiers to recognize the activity, giving you both both high accuracy and low battery usage.

Sign Up for Early Access

In the GCM service itself we’ve added support for messaging over XMPP with the new GCM Cloud Connection Server (CCS). Your servers now have a persistent connection over which to send large numbers of messages, very quickly, and with no overhead. New APIs in Google Play services let apps send messages back upstream to third-party servers using CCS, without needing to manage network connections. This helps keep battery and data usage to a minimum.

Also new in the GCM service is a User Notifications API. This new API lets you synchronize notifications across a user’s multiple devices — when the user dismisses a notification on one device, the notification disappears automatically from all the other devices. To get started with GCM, head over to the developer documentation.

Google+ Cross-Platform Single Sign On

Many people use apps on multiple devices throughout the day, switching between their laptops, tablets, and mobile devices. After signing-in to an app on one device, it’s natural that when they pick up a different device and use the same app, they would expect to be signed in there as well.

To help you provide this kind of seamless transition between platforms and stay connected with users across devices, we’re adding Cross-Platform Single Sign On to our Google+ Sign-In capabilities.

If your app is already using Google+ Sign-In, you’ve already got support for Cross-Platform Single Sign On. This feature will be enabled automatically over the coming days.

Cross-Platform Single Sign On gives you a great way to build longer-running, cross-platform user experiences, and it dovetails perfectly with the new Google Play games services for bridging game state across devices using the cloud.

More About Google Play Services

Google Play Services is our platform for offering you better integration with Google products, and providing new capabilities to use within your apps. To learn more about Google Play services and the APIs available to you through it, visit the Google Services area of the Android Developers site.

Today at Google I/O we announced a new IDE that’s built with the needs of Android developers in mind. It’s called Android Studio, it’s free, and it’s available now for you to try as an early access preview.

To develop Android Studio, we cooperated with JetBrains, creators of one of the most advanced Java IDEs available today. Based on the powerful, extensible IntelliJ IDEA Community Edition, we've added features that are designed specifically for Android development, that simplify and optimize your daily workflow.

Extensible build tools

We know you need a build system that adapts to your project requirements but extends further to your larger development environment. Android Studio uses a new build system based on Gradle that provides flexibility, customized build flavors, dependency resolution, and much more.

This new build system allows you to build your projects in the IDE as well as on your continuous integrations servers. The combination lets you easily manage complex build configurations natively, throughout your workflow, across all of your tools. Check out the preview documentation to get a better idea of what the new build system can do.

Powerful code editing

Android Studio includes a powerful code editor. It's based on the IntelliJ IDEA editor, which supports features such as smart editing, advanced code refactoring, and deep static code analysis.

Smart editing features such as inline resource lookups make it easier to read your code, while giving you instant access to edit code the backing resources. Advanced code refactoring gives you the power to transform your code across the scope of the entire project, quickly and safely.

We added static code analysis for Android development, helping you identify bugs more quickly. On top of the hundreds of code inspections that IntelliJ IDEA provides, we’ve added custom inspections. For example, we’ve added metadata to the Android APIs, that flag which methods can return null and which can’t, which constants are allowed for which methods, and so on. Android Studio uses that data to analyze your code and find potential errors.

Smoother and richer GUI

Over the past year we’ve added some great drag-and-drop UI features to ADT and we’re in the process of adding them all into Android Studio. This release of Android Studio lets you preview your layouts on different device form factors, locales, and platform versions.

Easy access to Google services within Android Tools

We wanted to make it easy for you to harness the power Google services right from your IDE. To start, we’ve made it trivial to add services such a cloud-based backend with integrated Google Cloud Messaging (GCM) to your app, directly from the IDE.

We’ve also added a new plugin called ADT Translation Manager Plugin to assist with localizing your apps. You can use the plugin to export your strings to the Google Play Developer Console for translation, then download and import your translations back into your project.

Try Android Studio and give us feedback

Give Android Studio a try and send us your feedback! It's free, and the download bundle includes includes everything you need, including the IDE, the latest SDK tools, the latest Android platform, and more. .

Note: This is an early access preview intended for early adopters and testers who want to influence the direction of the Android tools. If you have a production app with a large installed base, there’s no need to migrate your development to the new tools at this time. We will continue to support Eclipse as a primary platform for development.

The last year has been an exciting one for Android developers, with an incredible amount of momentum. In fact, over 48 billion apps have been downloaded from Google Play to date, with over 2.5 billion app downloads in the last month alone.

This week, at Google I/O, our annual developer conference, we’re celebrating this momentum, and putting on stage a number of new features and advancements both for the Android platform and Google Play, to help you design, develop and distribute great apps to your users.

We just wrapped up the keynote, and wanted to share a number of those new features; we’ll be spotlighting some of them throughout the week both here, on Google+, and in 36 Android sessions and sandboxes at the Moscone center in San Francisco (with many of the sessions livestreamed at developer.google.com). Enjoy!

Google Play Services 3.1

Google Play Services is our platform for bringing you easier integration with Google products and new capabilities to use in your apps. Today we announced a new version of Google Play Services that has some great APIs for developers.

Google Play games services give you great new social features that you can add to your games achievements, leaderboards, cloud save, and real-time multiplayer

Location APIs make it easy to add location- and context-awareness to your apps through a fused location provider, geofencing, and activity recognition

Cross-Platform Single Sign On, which lets your users sign in once, for all of their devices using Google+ Sign-In.

Android Studio: A new IDE for Android development

Today we announced a new Integrated Development Environment (IDE) built just for Android, with the needs of Android developers in mind. It’s called Android Studio, it’s free, and it’s available now to try as an early access preview.

To build Android Studio, we worked with with JetBrains, creators of one of the most advanced Java IDEs available today. Based on the powerful, extensible IntelliJ IDEA Community Edition, we've added features and capabilities that are designed specifically for Android development, to simplify and optimize your daily workflow for creating Android apps.

Google Play Developer Console: a better distribution experience

Building awesome Android apps is only part of the story. Today we announced great new features in the Google Play Developer Console that give you more control over how you distribute your app and insight into how your app is doing:

App translation service: a pilot program that lets you purchase professional translations for your app directly from the Developer Console.

Revenue graphs: a new tab in the Developer Console gives you a summary of your app global app revenue over time.

Alpha and beta testing and staged rollouts: you can now distribute your app to controlled alpha and beta test groups, or do staged rollouts to specific percentages of your userbase.

Optimization tips: design your app for tablets and understand how to expand your app into new language markets.

Google Analytics: launching later this summer, your Google Analytics usage stats will be viewable right in the Developer Console.

Referral tracking: also launching later this summer, you’ll get a new report in Google Analytics to show what blogs, campaigns, and ads are driving your installs.

Follow the Android Sessions

Join us for the Android sessions today and through the week by livestream. Visit the I/O Live Stream schedule for details.

There are a lot of great things a developer can do to promote their app, but the best way for your app to take off is when a really happy user tells their friend about your app, who tells their friend, who tells someone else — you get the picture.

That’s why it’s always been a priority for us to strengthen that conversation between developers and their users. Google Play is now connected with Google+, and by associating reviews with an identity, the quality of reviews has increased tremendously (in addition to letting users find reviews they trust).

We’re happy to announce today that all developers on Google Play can now reply to user reviews. You can reply to user reviews in the Google Play Developer Console, and your replies are shown publicly below the corresponding user review on Google Play. Users receive an email notification when you reply and can either reply to you directly by email, or update their review if they choose to do so -- though keep in mind that users are not obligated to update their reviews. You can also update your reply at any time.

Developers who have been using this feature have told us that the following best practices are most effective in improving their apps and building strong relationships with their users:

Check reviews frequently, and involve people from all parts of your organization

Identify and prioritize bugs based on user impact

Let users know when their problems are resolved

Reply constructively to both negative and positive reviews

Refer users to documentation or other support channels

Get ideas about new improvements or features

Thank the users who are your biggest advocates

Before replying to user reviews, it is important to review the posting guidelines to be sure that you are using this feature in compliance with Google Play’s policies at all times. The reply to each user’s review will be public, so prospective users will see if you provide consistently high quality customer support. Read the posting guidelines, and start connecting with users today.

Conversations are meant to be two-sided, and facilitating discussion between developers and users will ultimately yield better apps, to the benefit of everyone.

Google I/O 2013 is less than a week away, and the full session schedule - featuring 34 Android sessions (and 3 codelabs) - is now available. We have great Android content spread across three packed days - covering everything from design, development, and distribution.

Not everyone can come to San Francisco to join us in person, so we’ll be streaming a selection of the best content as part of Google Developers Live. In addition to the keynote and four session streams (including one dedicated to Android), you’ll see one-on-one product deep dives, executive interviews, and Sandbox walkthroughs broadcast from the GDL stage at I/O. All the live feeds will be available on the Google I/O homepage from the comfort of your own home - or join our Google Developer Groups to experience Google I/O as part of Google I/O Extended.

Whether you’re attending in person or virtually, you can follow all the action using the official Google I/O 2013 conference companion app! It supports devices running Android 2.3+, and is optimized for phones and tablets of all shapes and sizes.

Use it to view the conference sessions agenda and create your own personal schedule with reminders, view details on sessions, code labs, office hours, and speakers, track announcements, and even view the keynote and live streamed sessions throughout the conference!

If you’re attending in person, you can use it to guide yourself around the venue using the vector-based conference map, Android Beam session details, scan fellow attendee badges, and provide feedback on the sessions you watch.

And stay tuned after I/O when every Google I/O technical session will also be posted to GDL and YouTube, and the conference app will be open sourced.